<template>
  <div id="app">
    <h1>项目实战Code6</h1>
    <div class="container">
      <!-- 顶部框模块 -->
      <div class="form-group">
        <div class="input-group">
          <h4>品牌管理</h4>
        </div>
      </div>

      <!-- 数据表格 -->
      <table class="table table-bordered table-hover mt-2">
        <thead>
          <tr>
            <th>编号</th>
            <th>资产名称</th>
            <th>价格</th>
            <th>创建时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody>
          <tr v-for="item in list" :key="item.id">
            <td>{{ item.id }}</td>
            <td>{{ item.name }}</td>
            <!-- <td :class="{red:item.price > 100}">{{item.price}}</td> -->
            <td :style="{color:item.price > 100 ? 'red': ''}">{{ item.price }}</td>
            <td>{{ item.time}}</td>
            <td><a href="#" @click.prevent="delFn(item.id)">删除</a></td>
          </tr>

          <!-- 不用循环，展示总价 和 平均价 -->
          <tr style="background-color: #eee" v-show="this.list.length !== 0">
            <td>统计:</td>
            <td colspan="2">总价钱为: {{allPrice}}</td>
            <td colspan="2">平均价: {{avgPrice}}</td>
          </tr>
        </tbody>
        <!-- 底部的提示消息 -->

        <tfoot v-show="this.list.length === 0">
          <tr>
            <td colspan="5" style="text-align: center">暂无数据</td>
          </tr>
        </tfoot>
      </table>

      <!-- 添加资产 -->
      <form class="form-inline">
        <div class="form-group">
          <div class="input-group">
            <input type="text" class="form-control" placeholder="资产名称" v-model="name"/>
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <div class="form-group">
          <div class="input-group">
            <input type="text" class="form-control" placeholder="价格" v-model.number="price" />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <!-- 阻止表单提交 -->
        <button class="btn btn-primary" @click.prevent="addFn">添加资产</button>
      </form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      name: "",
      price: "",
      list:JSON.parse(localStorage.getItem('Plist')) || []
    };
  },
  methods: {
    delFn(id){
     this.list = this.list.filter(item => item.id !== id)
    },
    addFn(){
      if(this.name.trim().length === 0 || this.price === 0){
        return alert('请输入内容')
      }
      this.list.push({
        id: +new Date(),
          name: this.name,
          price: this.price,
          time: new Date(),
      })
      this.name = ''
      this.price = ''
    }
  },
  // filters: {
  //   formatTime(time){
  //    return moment(time).format('YYYY-MM-DD HH:mm:ss')
  //   }
  // }
  computed: {
    allPrice(){
     return this.list.reduce((sum,val) => sum += val.price ,0)
    },
    avgPrice(){
      return (this.allPrice / this.list.length).toFixed(2)
    },
  },
  watch: {
    list:{
      handler(){
        localStorage.setItem('Plist',JSON.stringify(this.list))
      },
      deep:true,
      immediate:true
    }
  }
};
</script>

<style>
.red {
  color: red;
}

</style>

